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Silver nanowires, and production method and dispersion of the same

a silver nanowire and production method technology, applied in metal-working apparatuses, transportation and packaging, etc., can solve the problems of difficult in many cases to sinter silver nanowires, difficult to effectively remove polymer protective agents through washing operations, and difficult to substitute polymer protective agents with other surface protective agents, etc., to achieve the effect of increasing the probability of contact, reducing the amount of organic substances remaining on the surface of nanowires, and high adhesiveness

Inactive Publication Date: 2017-05-04
UNIVERSITY OF SHIGA PREFECTURE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a new technique for coating silver nanowires with a protective agent, such as PVP. The problem with using PVP is that it has a high sintering temperature and can fuse under heat, making it difficult to sinter the nanowires after applying them on a transparent base material. To solve this problem, the inventors have found a new substitute called thiol which can securely bond to the nanowires and allows them to be dispersed in non-polar solvents. By substituting the protective agent with thiol, the nanowires can be easily dispersed in non-polar solvents and the amount of organic substances on the nanowires can be reduced, resulting in increased optical transparency of the conductive film.

Problems solved by technology

However, depending on the application, a silver nanowire dispersion using a solvent having small polarity or a nonpolar non-aqueous solvent is in some cases desirably used.
However, since one molecule of the polymer protective agent such as PVP adheres to metal silver of the wires at multiple points, it is generally difficult to effectively remove the polymer protective agent through a washing operation.
It is also difficult to substitute the polymer protective agent with another surface protective agent.
However, silver nanowires having the polymer protective agent such as PVP adheres thereon have a high sintering temperature, and it is difficult in many cases to sinter the silver nanowires after applying them on a transparent base material.
In particular, PVP also has a problem of easy fusing under heat.

Method used

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  • Silver nanowires, and production method and dispersion of the same
  • Silver nanowires, and production method and dispersion of the same
  • Silver nanowires, and production method and dispersion of the same

Examples

Experimental program
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Effect test

example 1

Synthesis of Silver Nanowires

[0066]Polyvinylpyrrolidone (PVP) having a weight average molecular weight of 55,000 was provided as an organic protective agent.

[0067]At normal temperature, 2.5 g of PVP and 0.006 g (0.1 mmol) of sodium chloride were added to and dissolved in 60 g of ethylene glycol to prepare a solution X. In a container different from the above, 0.85 g (5.0 mmol) of silver nitrate was added to and dissolved in 7.65 g of ethylene glycol to prepare a solution Y.

[0068]Under an air atmosphere, the whole volume of the solution X was heated to 135° C. with stirring at 500 rpm, and then the solution Y was added at once into the solution X. After completing the addition of the solution Y, the stirring speed was changed to 100 rpm, and the solution was maintained at 135° C. for 3 hours while keeping the stirring state. Then, the reaction liquid was cooled to normal temperature.

[0069]After cooling, washing was performed according to the following procedure to obtain a dispersion...

example 2

[0080]A nonpolar solvent dispersion of silver nanowires was obtained in the same manner as in Example 1 except that in the substitution operation of silver nanowire coating substance into a thiol, 1-decanethiol was used as the thiol for substitution on the wire surfaces. As the silver nanowires subjected to the substitution operation, the same nanowires as in Example 1 (PVP-coated silver nanowires) were used. According to a TG curve obtained under the same conditions as in Example 1, the ignition loss until 600° C. of the thiol (1-decanethiol)-coated silver nanowires after the coating substance substitution obtained in this example was 2.2%.

example 3

[0081]A nonpolar solvent dispersion of silver nanowires was obtained in the same manner as in Example 1 except that in the substitution operation of silver nanowire coating substance into a thiol, 1-octanethiol was used as the thiol for substitution on the wire surfaces. As the silver nanowires subjected to the substitution operation, the same nanowires as in Example 1 (PVP-coated silver nanowires) were used. According to a TG curve obtained under the same conditions as in Example 1, the ignition loss until 600° C. of the thiol (1-octanethiol)-coated silver nanowires after the coating substance substitution obtained in this example was 1.2%.

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Abstract

Silver nanowires coated with, instead of a polymer protective agent such as PVP, an organic protective agent having a smaller molecular weight are provided. The silver nanowires have an average diameter of 100 nm or less and an average length of 5 μm or more, and a thiol having a molecular weight of 75 to 300 is adhered on surfaces of the metal silver. The silver nanowires have a thiol containing one thiol group in the structure adhered thereon. A thiol having only one thiol group (—S—H) in a molecule is a suitable target. Examples thereof include 1-dodecanethiol, 1-decanethiol, 1-octanethiol, 3-mercapto-1,2-propanediol, monoethanolamine thioglycolate, ammonium thioglycolate, and thiomalic acid.

Description

BACKGROUND OF THE INVENTION[0001]Field of the Invention[0002]The present invention relates to silver nanowires that are useful, for example, as a material forming a transparent conductor, and a method for producing the silver nanowires. The present invention also relates to a silver nanowire dispersion in which the silver nanowires are dispersed.[0003]Description of the Related Art[0004]As used herein, “nanowires” refers to an aggregate of fine metal wires having a thickness of approximately 200 nm or less. When likened to powder, an individual wire corresponds to a “particle” constituting powder, and nanowires correspond to “powder” which is an aggregate of particles.[0005]Silver nanowires are expected as a promising conductive material for imparting electric conductivity to a transparent base material. When a transparent base material such as a glass, polyethylene terephthalate (PET), and polycarbonate (PC) is coated with a liquid in which silver nanowires are dispersed, and then ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22F1/02B22F9/24B22F1/00B22F1/0545B22F1/102
CPCB22F1/02B22F1/0018B22F2302/45B22F9/24B22F2301/255B22F1/0022B22F1/0547B22F1/0545B22F1/102
Inventor BALACHANDRAN, JEYADEVANHUAMAN, JHON LEHMAN CUYANAITO, TAKUYASATO, KIMITAKAKODAMA, DAISUKE
Owner UNIVERSITY OF SHIGA PREFECTURE
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